Process timer (CB21865E)

We found this timer for times of a few minutes in a 1974 Ferranti transistor manual. The relay is 37 mA sensitive type.

Ramp Generator (CB1434E )
This circuit was obtained in a 1973s documentation. The transistors may be BC558 for the PNP and...
Differential temperature alarm (CB26159E)
The sensors in this circuit that triggers when the temperature goes out of a certain range are...
MC34071 Active Band Pass Filter (CB15282E)
Other operational amplifiers series, such as MC34072, MC34074, MC35071, MC35072, MC35074 d MC33071...